MONACOR SPX-21M

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.3dB
• Frequency response 170 - 22000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 170Hz
• Mechanical quality factor QMS 4.66
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 1.2mm
• Air volume displaced at xmax VD 1.6cm³
• Power handling P 12W
• Program power Pmax 25W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.12mH
• VC Diameter 20mm
• Winding material Kapton

Magnet

• Force factor Bl 3.32N/A
• Motor constant Bl/√RE 1.72N/√W
• Diameter 29mm
• Weight 0.026kg

Diaphragm

• Effective diameter 41mm
• Effective area SD 13cm²
• Moving mass MMS 1.45g
• Moving mass (without air load) MMD 1.4g

Suspensions

• Stiffness KMS 1.67N/mm
• Compliance CMS 600µm/N
• Equivalent volume to the compliance VAS 0.14L
• Mechanical resistance RMS 0.33N·s/m

Dimensions

• Nominal diameter 2″
• 56 x 56mm
• Overall size 56 x 56mm
• Baffle cutout diameter 51mm
• Overall depth 34mm
• Flange thickness 1mm
• Mounting depth 33mm
• Net weight 0.09kg